From 7ae4b866f86f9ab7b99484b56dd303a860ad1cc9 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Thu, 4 Nov 2010 14:24:24 +0200 Subject: virtio: return correct capacity to users We can't rely on indirect buffers for capacity calculations because they need a memory allocation which might fail. In particular, virtio_net can get into this situation under stress, and it drops packets and performs badly. So return the number of buffers we can guarantee users. Signed-off-by: Michael S. Tsirkin Signed-off-by: Rusty Russell Reported-By: Krishna Kumar2 --- drivers/virtio/virtio_ring.c | 3 --- 1 file changed, 3 deletions(-) (limited to 'drivers') diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 1475ed6b575..cc2f73e0347 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -230,9 +230,6 @@ add_head: pr_debug("Added buffer head %i to %p\n", head, vq); END_USE(vq); - /* If we're indirect, we can fit many (assuming not OOM). */ - if (vq->indirect) - return vq->num_free ? vq->vring.num : 0; return vq->num_free; } EXPORT_SYMBOL_GPL(virtqueue_add_buf_gfp); -- cgit v1.2.3-70-g09d2 From 22e132ff2645aab1e1a25c45e9544a39ae1dc106 Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Sat, 6 Nov 2010 10:06:50 +0100 Subject: Char: virtio_console, fix memory leak Stanse found that in init_vqs, memory is leaked under certain circumstanses (the fail path order is incorrect). Fix that by checking allocations in one turn and free all of them at once if some fails (some may be NULL, but this is OK). Signed-off-by: Jiri Slaby Cc: Amit Shah Cc: virtualization@lists.linux-foundation.org Cc: Greg Kroah-Hartman Signed-off-by: Rusty Russell --- drivers/char/virtio_console.c | 37 +++++++++---------------------------- 1 file changed, 9 insertions(+), 28 deletions(-) (limited to 'drivers') diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 6c1b676643a..896a2ced1d2 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -1547,31 +1547,16 @@ static int init_vqs(struct ports_device *portdev) nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); - if (!vqs) { - err = -ENOMEM; - goto fail; - } io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); - if (!io_callbacks) { - err = -ENOMEM; - goto free_vqs; - } io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); - if (!io_names) { - err = -ENOMEM; - goto free_callbacks; - } portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), GFP_KERNEL); - if (!portdev->in_vqs) { - err = -ENOMEM; - goto free_names; - } portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), GFP_KERNEL); - if (!portdev->out_vqs) { + if (!vqs || !io_callbacks || !io_names || !portdev->in_vqs || + !portdev->out_vqs) { err = -ENOMEM; - goto free_invqs; + goto free; } /* @@ -1605,7 +1590,7 @@ static int init_vqs(struct ports_device *portdev) io_callbacks, (const char **)io_names); if (err) - goto free_outvqs; + goto free; j = 0; portdev->in_vqs[0] = vqs[0]; @@ -1621,23 +1606,19 @@ static int init_vqs(struct ports_device *portdev) portdev->out_vqs[i] = vqs[j + 1]; } } - kfree(io_callbacks); kfree(io_names); + kfree(io_callbacks); kfree(vqs); return 0; -free_names: - kfree(io_names); -free_callbacks: - kfree(io_callbacks); -free_outvqs: +free: kfree(portdev->out_vqs); -free_invqs: kfree(portdev->in_vqs); -free_vqs: + kfree(io_names); + kfree(io_callbacks); kfree(vqs); -fail: + return err; } -- cgit v1.2.3-70-g09d2 From be6528b2e58d92ef2ffed6f130e2d42bb85dbf29 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Tue, 9 Nov 2010 22:20:29 -0800 Subject: virtio: fix format of sysfs driver/vendor files The sysfs files for virtio produce the wrong format and are missing the required newline. The output for virtio bus vendor/device should have the same format as the corresponding entries for PCI devices. Although this technically changes the ABI for sysfs, these files were broken to start with! Signed-off-by: Stephen Hemminger Signed-off-by: Rusty Russell --- drivers/virtio/virtio.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers') diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c index 3a43ebf83a4..efb35aa8309 100644 --- a/drivers/virtio/virtio.c +++ b/drivers/virtio/virtio.c @@ -9,19 +9,19 @@ static ssize_t device_show(struct device *_d, struct device_attribute *attr, char *buf) { struct virtio_device *dev = container_of(_d,struct virtio_device,dev); - return sprintf(buf, "%hu", dev->id.device); + return sprintf(buf, "0x%04x\n", dev->id.device); } static ssize_t vendor_show(struct device *_d, struct device_attribute *attr, char *buf) { struct virtio_device *dev = container_of(_d,struct virtio_device,dev); - return sprintf(buf, "%hu", dev->id.vendor); + return sprintf(buf, "0x%04x\n", dev->id.vendor); } static ssize_t status_show(struct device *_d, struct device_attribute *attr, char *buf) { struct virtio_device *dev = container_of(_d,struct virtio_device,dev); - return sprintf(buf, "0x%08x", dev->config->get_status(dev)); + return sprintf(buf, "0x%08x\n", dev->config->get_status(dev)); } static ssize_t modalias_show(struct device *_d, struct device_attribute *attr, char *buf) -- cgit v1.2.3-70-g09d2